Influence of Concentrations of Li₂MoO₄ on Corrosion Behavior of Carbon Steel in High Temperature 45 mass％ LiBr Solutions

Abstract

Our research group investigated polarization curves and corrosion mass losses of a carbon steel immersed in deaerated 45 mass％ LiBr solutions containing LiOH and Li₂MoO₄ at 393 K. A corrosion potential was initially about －0.8 V for 50～250 ks and then rapidly shifted in a range from －0.45 to －0.2 V regardless of the Li₂MoO₄ concentration. An oxide film consisting mainly of Fe₃O₄ was formed on the carbon steel whose corrosion potential shifted up. It was inferred that the corrosion mass loss increased at a constant rate while the corrosion potential showed －0.8 V was maintained, and that the corrosion rate after the potential became noble was negligibly small.